The cloud of toxic smog is currently above Surrey on what is classified as a "moderate" level but this will reach a level five by Sunday (May 8).

A statement by DEFRA said the air pollution is being caused by a "southeasterly airflow from the continent" and is likely to encourage "moderate" air pollution to persist across many areas of England and Wales.

Predictions for air pollution levels in Surrey on Sunday (May 8)

Speaking on Thursday a spokesperson from the Met Office said: "Air pollution levels are slightly higher today, but are still in the lower bands.

"Pollution might affect people prone to lung conditions; if they notice any change in their symptoms the advice is to consider their habits, lower their exertion levels outside, and be mindful.

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"At the moment, it's not high. Most of England is experiencing moderate levels of air pollution."

The impending toxic smog is due to arrive in the county as forecasters predict a sizzling weekend with temperatures of up to 23C (73F) on the cards in some areas.

Sunglasses on standby as the warm weather is set to continue (Image: Darren Quinton)

The Met Office is predicting not only temperatures well into double figures, but weather that would give the Mediterranean a run for its money.

Residents of north Surrey in the likes of Staines and Weybridge will experience the highest temperatures of 23C over Sunday into Monday (May 8-9) thanks to south-easterly winds bringing warmer weather.